Taken from there site
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List of known issues
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1. MULTIPLAYER LEADER BOARD SCORING AND PROGRESS TRACKING
- Occasionally multiplayer game sessions are not properly recorded on the multiplayer leaderboards
- Because of this issue, online statistics (played matches, wins/losses, experience points and user level) do not always update properly, and progress might be lost (reset back to old state)
- This issue does not affect single player leaderboards or user created track leaderboards. Only multiplayer is affected.
- This issue doesn't affect all players. If you are affected, you can still practice multiplayer, but your score might not be updated before we get a title update out.
- We are currently working on a fix for this issue.
2. MULTIPLAYER "UNDEFINED TRACK" ERROR MESSAGE
- Occasionally "UNDEFINED TRACK" error is shown in multiplayer track voting screen. When this happens, the game is cancelled and players must search for a new game.
- We know the cause and the issue will be fixed in the forthcoming update.
3. SKILL GAME EXPLOITS
Unfortunately there are some exploits in two of the skill games Ball of Steel and Icarus Factor) that are resulting in unnaturally high Leaderboards positions. We are aware of these issues and are working on a fix as soon as possible, likely in the first title update.
We are sorry about the difficulties, and are working hard to fix them as soon as possible.